Superconductivity in MgB_2 doped with Ti and C

Details Superconductivity in MgB_2 doped with Ti and C Superconductivity in MgB_2 doped with Ti and C

2004-11-22

arxiv.org/abs/cond-mat/0411531v1

Physics

Condensed Matter

Superconductivity

11 pages, 10 figures

Scientific paper

10.1016/j.physc.2004.11.022

Measurements of the superconducting upper critical field, H_{c2}, and critical current density, J_c, have been carried out for MgB_2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron in the MgB_2 lattice and apparently shortens the electronic mean free path thereby raising H_c2. Titanium forms precipitates of either TiB or TiB_2 that enhance the flux pinning and raise J_c. Most of these precipitates are intra-granular in the MgB_2 phase. If approximately 0.5% Ti and approximately 2% C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form MgB_2, the resulting superconductor has H_{c2}(T=0) ~ 25 T and J_c ~ 10,000 A/cm**2 at 5 K and 2.2 T.

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